With winners announced and organizers now regrouping to analyze the next stages, the Novartis mHealth Challenge - held last weekend in San Francisco and giving away over $40,000 in prize money - has demonstrated that for developers looking to aggregate APIs together into a health-focused, consumer-facing end-product, there is still plenty of room to enter the growing market. ProgrammableWeb spoke to Cheryl Cheng, one of the organizers of the hackathon and winners from Sense.ly to see what other API developers can learn from the outcomes.

One of the bigger challenges with anything involving APIs is scale. As the number of APIs proliferate, the scalability demands from a management perspective become increasing untenable. Nowhere does that become more apparent than when dealing with mobile computing applications.

This API allows you to process Vantiv services via the Hosted Payments solution on the Express payment platform. It provides a way to process a single sale transaction and store card data in PASS to...